docs: def get_next_section_start_line(self, data):
          """Get the starting line number of next section.
          It will return -1 if no section was found.
          The section is a section key (e.g. 'Parameters:')
          then the content
  
          :param data: a list of strings containing the docstring's lines
          :returns: the index of next section else -1
  
          """
          start = -1
          for i, line in enumerate(data):
              if isin_alone([k + ":" for k in self.opt.values()], line):
                  start = i
                  break
          return start